If f : R → R is defined by f(x) = 2ˣ, then f is:
If f : R → R is defined by f(x) = 2ˣ, then f is:
- A. one-one and onto
- B. one-one but not onto
- C. onto but not one-one
- D. neither one-one nor onto
Answer: B) one-one but not onto
Explanation: 2ˣ is strictly increasing → one-one. Range is (0, ∞), not all real numbers → not onto.
0 Answers
Log in to post your own answer or join the discussion.
No comments yet — start the discussion.